XML 108 R95.htm IDEA: XBRL DOCUMENT v3.10.0.1
Employee Benefits (Components fo net Periodic benefit cost) (Details 3) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Pension Benefits      
Net periodic benefit cost for pension plans and the postretirement benefit plan      
Service Cost $ 0 $ 0 $ 0
Interest Cost 4,193 4,665 4,882
Expected Return on Plan Assets (5,122) (5,011) (5,121)
Amortization of Prior Service Credit 0 0 0
Amortization of Net Actuarial Losses (Gains) 2,099 1,817 1,617
Net Periodic Benefit Cost $ 1,170 $ 1,471 $ 1,378
Weighted average assumptions used to determine the benefit obligations      
Discount Rate (as a percent) 4.41% 3.90%  
Weighted average assumptions used to determine the net periodic benefit cost      
Discount rate (as a percent) 3.90% 4.45% 4.70%
Expected Long-Term Rate of Return on Plan Assets (as a percent) 5.75% 5.75% 6.00%
Health Care Cost Trend Rate (as a percent) 0.00% 0.00% 0.00%
A one percent change in the health care cost trend rate assumption impact on cost      
Expected future employer contributions, next fiscal year $ 500    
Expected benefits to be paid in each of the next five years and in the aggregate for the five years thereafter      
2019 6,918    
2020 7,020    
2021 7,163    
2022 7,189    
2023 7,195    
Years 2024-2028 35,466    
Postretirement Benefits      
Net periodic benefit cost for pension plans and the postretirement benefit plan      
Service Cost 457 $ 453 $ 513
Interest Cost 936 1,093 1,134
Expected Return on Plan Assets 0 0 0
Amortization of Prior Service Credit (567) (322) (322)
Amortization of Net Actuarial Losses (Gains) (264) (435) (393)
Net Periodic Benefit Cost $ 562 $ 789 $ 932
Weighted average assumptions used to determine the benefit obligations      
Discount Rate (as a percent) 4.48% 3.96%  
Health Care Cost Trend Rate Assumed, Next Fiscal Year 6.00% 6.30%  
Ultimate health care cost trend rate (as a percent) 4.50%    
Year that reaches the ultimate health care cost trend rate 2036    
Weighted average assumptions used to determine the net periodic benefit cost      
Discount rate (as a percent) 3.96% 4.57% 4.74%
Expected Long-Term Rate of Return on Plan Assets (as a percent) 0.00% 0.00% 0.00%
Health Care Cost Trend Rate (as a percent) 6.30% 6.50% 6.70%
A one percent change in the health care cost trend rate assumption impact on cost      
Expected future employer contributions, next fiscal year $ 900    
Expected benefits to be paid in each of the next five years and in the aggregate for the five years thereafter      
2019 886    
2020 943    
2021 1,020    
2022 1,137    
2023 1,231    
Years 2024-2028 $ 7,982